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https://github.com/moby/moby.git
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e4b6adc88e
This cleans up some of the package API's used for interacting with volumes, and simplifies management. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
package service // import "github.com/docker/docker/volume/service"
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import (
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"fmt"
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"strings"
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)
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const (
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// errVolumeInUse is a typed error returned when trying to remove a volume that is currently in use by a container
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errVolumeInUse conflictError = "volume is in use"
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// errNoSuchVolume is a typed error returned if the requested volume doesn't exist in the volume store
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errNoSuchVolume notFoundError = "no such volume"
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// errNameConflict is a typed error returned on create when a volume exists with the given name, but for a different driver
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errNameConflict conflictError = "volume name must be unique"
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)
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type conflictError string
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func (e conflictError) Error() string {
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return string(e)
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}
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func (conflictError) Conflict() {}
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type notFoundError string
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func (e notFoundError) Error() string {
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return string(e)
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}
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func (notFoundError) NotFound() {}
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// OpErr is the error type returned by functions in the store package. It describes
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// the operation, volume name, and error.
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type OpErr struct {
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// Err is the error that occurred during the operation.
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Err error
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// Op is the operation which caused the error, such as "create", or "list".
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Op string
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// Name is the name of the resource being requested for this op, typically the volume name or the driver name.
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Name string
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// Refs is the list of references associated with the resource.
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Refs []string
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}
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// Error satisfies the built-in error interface type.
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func (e *OpErr) Error() string {
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if e == nil {
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return "<nil>"
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}
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s := e.Op
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if e.Name != "" {
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s = s + " " + e.Name
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}
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s = s + ": " + e.Err.Error()
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if len(e.Refs) > 0 {
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s = s + " - " + "[" + strings.Join(e.Refs, ", ") + "]"
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}
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return s
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}
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// Cause returns the error the caused this error
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func (e *OpErr) Cause() error {
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return e.Err
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}
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// IsInUse returns a boolean indicating whether the error indicates that a
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// volume is in use
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func IsInUse(err error) bool {
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return isErr(err, errVolumeInUse)
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}
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// IsNotExist returns a boolean indicating whether the error indicates that the volume does not exist
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func IsNotExist(err error) bool {
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return isErr(err, errNoSuchVolume)
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}
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// IsNameConflict returns a boolean indicating whether the error indicates that a
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// volume name is already taken
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func IsNameConflict(err error) bool {
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return isErr(err, errNameConflict)
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}
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type causal interface {
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Cause() error
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}
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func isErr(err error, expected error) bool {
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switch pe := err.(type) {
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case nil:
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return false
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case causal:
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return isErr(pe.Cause(), expected)
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}
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return err == expected
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}
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type invalidFilter struct {
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filter string
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value interface{}
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}
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func (e invalidFilter) Error() string {
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msg := "Invalid filter '" + e.filter
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if e.value != nil {
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msg += fmt.Sprintf("=%s", e.value)
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}
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return msg + "'"
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}
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func (e invalidFilter) InvalidParameter() {}
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